Okay. Let's see if I can say it really clearly and briefly.
First Class: Perpetual Motion, as a noun, where it could be written PerpetualMotion, or Perpetual-motion, is what the scientists mean, and what the laymen usually do NOT mean. This PM means, once started into motion, no added energy, no energy loss, and continuing to run perpetually.
Second Class: Perpetual motion as the layman usually means it is where you get out at least a little more energy than you put in. Magnet motor generators fall into this class.
First Class is impossible by any means science understands because their is always loss due to friction.
Second Class is impossible because you can't get more out of something than there is in it.
There is a Third Class. This is where a form of energy that we do not understand and can't even observe is going in, and it is being converted, to come out in a form that we DO understand, like static magnetism or active electricity. There are all kinds of people that call this Third Class, PERPETUAL MOTION.
If anybody is so bold that he claims that he knows FOR A FACT that we know everything about the universe, he is a fool. We ABSOLUTELY DON'T know for a fact that a magnet is NOT a converter of some form of energy that we know little or nothing about, and that the magnet, itself, helps us to convert that unknown energy into electrical energy.
Is someone wrong for calling something like this magnetic generator/motor a perpetual motion machine? In the technical sense, yes. But there will come a time - and it might be here already - when enough people call this a PM machine, so it is accepted by such in the eyes of everybody.
There are two more things to say:
1. much of the disagreement in this topic is over semantics;
2. I believe that there are political trolls who are constantly suggesting that such a "perpetual motion" machine can't work, because they are working for the government and the power companies, and are trying to keep the power companies from losing any more money than they are already losing to solar.
You're correct in saying no-one knows everything about the universe, it would be foolish if they thought that. But we do know a hell of a lot about magnets, and can harness their electromagnetic field, with turbines and generators. It's been proven by many experiments that electricity and magnetism are linked - hence the electromagnetic force.
No experiment has EVER shown that magnets themselves convert any sort of "unknown energy" into any other sort of energy. We know through experiments that magnetic force is a result of aligned electron orbitals at the atomic level, forming magnetic domains in the material. These domains line up in magnetic materials, creating a generic magnet with a north and south pole. You can make your own magnet by taking a piece of iron, then rubbing a magnet across it in one direction, which aligns the domains in the iron in the same direction, creating another magnet.
So although we don't know this 100%, every properly done experiment ever seems to prove it.
I mean you could say that the magnetic force actually comes from Evel Knievel's ghost driving a microscopic motorbike round a neodymium wall of death in the 5th dimension, which powers a supernatural trans-dimensional energy field, in turn giving magnets their magical powers here on Earth. We ABSOLUTELY DON'T KNOW for a fact that this isn't true, but it's much more sensible for us to look at the science from the last few hundred years and conclude that it's most likely due to the above explanation. But yes, we still have a lot to learn about field theory (gravity in particular).
As for the political trolls constantly suggesting these machines can't work, that may be true, but you will find hundreds of thousands of advanced physicists all over the globe with the same conclusions, and they can't all be working for the power companies. I have an open mind, but I won't believe any stories about harnessing unknown forms of energy until I see some real scientific proof, which isn't in the form of a dodgy youtube video.